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Across
  1. 3. state with most national parks
  2. 4. oil released by poisonous plants
  3. 6. mother ______
  4. 8. natural places where animals call home
  5. 12. first national park
  6. 16. top of a backpack
  7. 17. leaves of _____let it bee
  8. 19. find old-growth here
  9. 20. a knot easily undone by a tug
  10. 21. a baseline knot that can be impossible to untie
  11. 22. /white _____ national park
Down
  1. 1. and _____ the planet
  2. 2. be used as heat source or emergency signal
  3. 5. the most influential grassroots environmental organization in the US
  4. 7. smallest national park
  5. 9. poisonous ropelike vine
  6. 10. also known as the shoelace knot
  7. 11. ____ national park
  8. 13. sequoia, redwood, pine
  9. 14. explore ____ and protect
  10. 15. we are______ together
  11. 18. where tallest tree in the world is located
  12. 20. poisonous woody shrub